Filing machine



J. V. MARR ET AL Aug. 14, 1951 FILING MACHINE Filed April 2, 1947 2 She'etSSheet 1 Clttorneg Aug- 14, 1951 J. v. MARR ET AL 2,564,490

FILING MACHINE Filed April 2, 1947 2 Sheets-Sheet 2 55- 55 z Ik 55|. f 35 z E20:i 5oJ f3@ 57 56 5/ l 40 -5/ 50/ y m50 L LJ L; i 5/` 55 "fgzO-i Jq/ 5"/ 4M @M/t@ Patented Aug. lT4, 11951 FILING MACHINE `JohnV.` Marr and vWilliam G. Mercer, Fayetteville,l N. C., as svignors of twenty per cent to Carl A. Barrington, Fayetteville, N. C.

Application April 2, 1947,'Serial No. 738,956

1 This invention relates,` in general, to improvements in portable,-power driven machines for actuating various types of ltools which are operated by a reciprocating motion, as in the use of a file or saw, for example.

More particularly, ,the invention. is directed to an improved construction of a portable, power driven machine which isdesigned to reciprocate an elongate tool such as file, or the like, in the same general manner in which the tool would be.

operated by hand, but at. considerably greater speed and uniformity in the vWorking stroke thereof.

an improved, portable powerdriven machine of this character in a relatively `compact and simpliiied design through the use of a highly efficient rack and gear actuating mechanism which imparts a constant and uniform working stroke to the tool in both directionsof reciprocation thereof.

A further object of the invention to provide a4 portable, power driven filing machine, or the like, embodyingsuch a. rack and gear actuating mechanism in combination with a body member mounted for reciprocation, on anti-friction means which ensures smooth, even and uniform y operation of the tool at comparatively high speed. I

Another object of the. invention is forV the provision of aportable, power driven machine. of '30 the kind described which involves relatively few l parts in the highly simplified construction thereof, and accordingly, is admirably suited formanuv facture at comparatively low cost.

Further objects and advantages of the 'inven-i I tion, and other new and useful features in the construction, arrangement and general combination of parts will be readily apparent as the Vfollowing description proceeds with reference to the accompanying drawings, for purposes of illustration but not of limitation, in which like reference characters` designate like parts throughout, andinwhich: Q.

Fig. 1 is a side elevation view of the improved l tool operating machine inl accordance with the.

invention;

Fig. 2 is a top plan of the machine as shown l Fig. 3 is an enlarged sectional view of Fig. 1

taken on line 3-3,'looking in the direction of theff50 arrows; and.

4 is an enlarged, fragmentary top plan view of the machine `[with the motor casing and base ,plate removed to disclose the rack and gear actuating. .mechanism .Said fads mechanism bef..

I, A primary object of theinvention is to provide ing shown in the retracted position stantially as represented in broken lines. K

Referringnow, more particularly, to the drawings, Figs. 1 and 2 show the improved tool operating machine of the inventionas constructed in a portable power-driven apparatus adapted to impart a reciprocating motion to' atool element such as a file, rasp, or the like, in close simulation to the movements of a hand operated filing... implement but at considerably greater speed andH The uniformity in the Working stroke thereof. machine comprises, in general, a body designated generally A anda reciprocable carriage or tool@ carrier designatedfgenerally BWhich is mounted; in.' said body for Ireciprociation relative thereto.`

As illustrated in Figures 2 and 3, the machine.v body Acomprises agenerally rectangular base` plate Ill secured 'along its longitudinal edges by screvvsor stud bolts II tothe upper surfacesof spaced, 4parallel sideplates 30 to define aninverted, generally channel-shaped housing within'zwhich the tool'carrier or vcarriage B is mounted' for reciprocating 'movement longitudinally of the machine body. The base plate I0 and the mecha/,3.- nism carried thereby define a subassembly unit Whichvis reinovably'secured to the side plates 30 by said 'fasteners I'I'. This unit comprises ar ro'-' tary motorshaft I4 extending vertically through.

an A*opening inthe base plate I0 and supported relative thereto by a'thrust bearing I5 secured by a press fit in a countersunk opening in said base' plate. A. segmental drive' gear 2li, Figures 2, 3, ande, having a predetermined number 'of teeth;

2l v'on a portion only of itsperiphery is keyed or otherwise fixedly connected inany suitable manner to the lower end of the 'rotary shaft I4 below me base .plate lu.V A hollow Shen or casing 24 is supported above the base plate I0 in concentric relation to theshaft" I`4a'nd Within said'casing,'" an electricv motor '(not shown) is provided drive saidfrotary shaft I4.

A handleyri'gures 1 and 2, is 'mounted on said, base plate. I0 and is preferably in the form ofV a' horizontal arm 25 combined with a vertical arm 26 which'is secured to the base platein any desired manner as by 'a stud bolt 21, Figj ure l. Ther horizontal arm 25 'of the handle lis united to the motor casing 24 in any suitable Wayy and is provided with a longitudinal bore' receiving an electrical. wire conduit 28 leading to vthe .motor within the casing 24, and adapted to be connected to a source of power. The wire" enduit-28'. eceerdmgly is cereale@ end .Pmi-

of the recip rocating carriage or tool carrier and withA the, relative forward movement thereof indicated subtected within the handle arm 25 in a manner which minimizes the possibility of damage or injury thereto in the handling or operation of the machine. A switch 29 is so provided that it may be conveniently operated by the thumb of the operator as the vertical handle 26 is held during the operation and use of the machine. 'Ihe handle' of this kcharacter otherwise is advantageous in `that the v'horizontal arm 25 provides a convenient means for transporting the machine and also, for exerting pressure thereon most eiectively in a direction generally normal to the work surface operated upon by the machine. I

The described unit carried'by the base ,plate I0, accordingly, is admirably suited' for ready extend upwardly into the machine body A between the side plates 30 in position to receive in the space therebetween the segmental drive gear 20 on the rotary shaft |4. On the inner faces of said flanges 4|, toothed racks 55, 56 are secured thereto in any expedient manner as by screws applied through passages in the ends of the racks. Said toothed Tracks 5.5; 5,5, are thus oppositely disposed on "the -side anges 4| such that the teeth thereon, 51 and 58, respectively, are adapted alternately to mesh with the teeth 2;| on the segmental drive gear 20 during rotation of said drive gear in the operation of the machine, as lpresently .to be described.

attachment to the spaced, parallel Side 1I2 late,S.v

30 by the screws in a relatively quick and easy assembling operation. 'Ihe said side plates 30 are of relatively sturdyfconstruction and have substantially thelsame dimensions and Aconigu' ration. The inner-faces -of these fplates are pro-v vided -with 'longitudinal slots -orgrooves 3|, Figure 3, defining parallel gu-ideways ortrackways for anti-friction rollers, or the like, which mount theV associated carriageor `tool carrier B -in the completed machine. 'The upper surfaces of the side plates 3U preferably are rabbeted yto provide longitudinal recesses VJ33 Afor receiving -the opposing longitudinal edge portions of the base plate VH) which are'secured by the screws threaded into tapped `bolt holes 35, Figure 4, provided inV said s ide plates;V `The described rabbeted ljoint connection ofthe base plate I to the side plates 30 provides'v the same with the maximum strength necessary to withstand any laterajl 'thrust or other Yforce which might possiblyitend to vdistort, the spaced side plates 30 frlem their proper parallel spaced relation in the assembled machine body.` Tothis end, as many boltsor screwsl] as` are necessary or desirable may 'be employed to secure the vside plates 30 tetbe b a'se 'plate |10iWth'the required'strength and" rigidity; depending Leni' the Size 'of` the .filing machine ,and thenetlire' of' the Werk' to be Per* fermed tlflerebiy;A

earriase kor 'wel .carrier Bis an elongate.' generally channel-shapedrnerrber 40 which is o ,ffa width substantially equal' `tothe space between the spaced side'platjes 30 and which' defrnes'upstendine Spacedside flanges or Walls 41': T helewer central area efthis member forms e' blade holdingportion 42""comprising Va latbearissurface te whch'there iS secured a ille, 'rasp or"othe1r .tool4 3'1byjstudfboltsor screw 44 ap plied through countersunk" openings inthe ends of' said tool, substantially'as s hown in Figure l.y

The' arrangement is s uch that 'the le 43`or other taal supported in downwardly projecting relation to the lowerV surfaces of the side plates 3|! with ,the adjacent A longitudinal ,edges ,ofv the blade"h`older 42 being bevelled outwardly and upwardly from said tool 43, as shown in Figure 3.

.On the outer side faces of the carriage 40, there are mounted'two er more pairs of antifriction rollers 5|)V having a diameter .and width approximating the size of the trackways 3| in the s ide walls 30,. 'These antiriction rollers preferablyinclude ball bearings for maximum eiliciency andare mounted to the carriage 40 in any Withv the various parts of the machine provided substantially in the manner described, it will be understood, that the machine is easily and kquickly assembled simply by positioning the side -plates 30, Fig. 3, onr either side of the carriage or blade holder 40 with the antifriction rollers received `U'Jnthe -rtrackways 3|. in fsaid side plates. After .such .assembly .of the blade holder 4 0 and side. plates :3.0, .the side lplateslarie` held ,in spaced .parallel relation directly. .oppdsite each other, whereupon the .previously de. scribed sutbassexnbly` .unitcar-ried Aby thebase plate I0 is assembled :therewith by seating said base .plate .in the-rabbeted `recesses 33-'1in the? upper surfaces of thersideplates/3U. As-the-A base plate :is lowered 4into-'such position, the seg-1 mental :gear 2=0 -fis receivedwbetw-een the oppose'- ing ytoothed racks `55, V56.411' yeperative relation'` thereto substantially as shown in Figures 2 4" inclusive.V The studfboltslorlserews ar'e then applied to the tapped holes-*35, Figures 3 and 4,1 in the side plates 30 to secure the same to the base plate .|10v gin lcompleting `the "assembly of -thei fiol suitable way Vas'by .pintles secured by a driveV fit in 'holes bored into the sides of the carriage member '40.

The spaced sidel flanges 4| of the carriage 4|] 'cated bythe 'upper-arrow f'n- #Figure lgithusact machineV a minimum of time and? assembling operations. l5 f "In'operation, it'willibe apparent that when th'e switch 29 is turned on to supply electric current the motor vwitlriin lthe Ycasing 2;4', the motorishaft I4 `Vrota-tes' `the segmental gea-r -2 0' Alfixed thereto in" a clock-wise direction, as indicatedby theicurved arrow Lin Figure 4. Asv Said gear-*20 rotatesy--the teeth A'2| thereon alternately-mesh with the -teetl=r5 51 and 58 vonthe respective toothed racks 55 and- 56, Figures l2 and 4, to reciprocate the carriage or tool carrier 40 relative-tothe machinebody Referring to Figure 4, it'willbeunderstood YthatV in `thepresent illustrattori;thev tool zcarrier carriage' 40 is represented as "fsubstantiallyfully retracted relative'to the machine body A".V `In this f relation, the segmental gear 2 0`is Iin'more o rrless'v neutral position with the'teeth j2'1l thereenilSt about to disengage fromfth'e' teeth l-'l 'Yon raclrf55'- andto mesh with `the' teeth 53 on lrack 561 "Clocklwise rotation ofk Vthel gear-lfrdm theposition shown irl-Figure 4, accordingly,'causes-the Ateetlfi "Y 2| thereon :to engagesaidteethf and'v-,causelth Vactuated in its' 'forward"stroker At Athe-end of such forward stroke, theteeth 2| on gear'2fare thereupon disposed in position to engage-with-#the teeth 5 1 on rack 55 to effect the rearward rn ment `of the tool carrier 40,: This'vtakes 'place i on further clockwisefrotation of'thef'gearf'iftdf cause the teeth 2| thereon to mesh with the a jacent teeth-#57 on rack 5 5 'beginning with those teeth at the rearendfof` saidgrack." The rack-'55, is'thereby caused 'to' 'travel other ht,V as n'V ating the tool carrier 40 in its rearward or return stroke. The position of the racks 55, 56 at the limit of such return stroke is substantially as represented in full lines, in which relation the tool carrier is substantially fully retracted, and thus set for further reciprocations forwardly and thence rearwardly in a, continuous repetition of the foregoing described cycle of the operation of the machine.

It will be appreciated that the novel driving means comprising the opposed racks and segmental gear actuating mechanism enables the machine to operate at relatively high speed in providing a rapid reciprocation of the tool carrier 40 which imparts the desired reciprocation to the file 43, rasp or other tool attached to said tool carrier. The reciprocating movement of the tool is constant and uniform in both its forward and rearward strokes and consequently by the use of the present invention, a work surface can be quickly treated with exceptionally ne results and by a minimum of effort on the part of the operator of the machine. To this end, the antifriction rollers 50 which are positioned in the trackways 3| to support the tool carrier 4B in the machine, reduce to a minimum the friction and drag taking place in the reciprocating movement of the tool carrier 40 within the machine body, particularly when pressure is placed upon the machine to force the file or other tool rmly against a work surface. The operator, therefore, is required to exert relatively little pressure on the handle arms 25, 26 in pushing the machine against the surface being treated.

An inherent advantage of the invention is the comparatively light weight construction of the machine such that it is easily portable and readily manipulated on a work surface.

A further advantage resides in the highly simpliied and compact structure of the machine and the minimum number of parts required in the construction thereof which makes possible the economical quantity production of the machine at relatively low cost.

While the invention has been described in detail with a specific example, such example is intended as an illustration only, Since it will be apparent to those skilled in the art that other modifications in the construction, arrangement and general combination of parts may be devised without departing from the spirit and scope of the invention. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, with all changes falling within the scope, meaning and range of equivalency of the claims intended to be embraced therein.

What is claimed and desired to be secured by United States Letter Patent is:

1. In a tool of the class described, a generally channel-shaped body defining a base and spaced side plates extending downwardly from said base,

said side plates having longitudinally extending trackways on the inner faces thereof, a carriage within said generally channel-shaped body comprising a tool carrier surface and spaced upstanding flanges in parallel relation to said downwardly extending side plates of the tool body and having spaced inner walls, opposed toothed racks on said spaced inner walls of said upstanding flanges, antifriction rollers mounted on the outer sides of said carriage and received in said trackways in said side plates of the tool body to support said carriage in said tool body, a motor carried by said base of the tool body, a rotary shaft driven by said motor, a segmental gear secured to said shaft :below said base and positioned between said opposed toothed racks, said segmental gear being rotatable by said shaft to mesh alternately with said opposed toothed racks for imparting successive opposite movements to said carriage.

2. In a tool of the class described, a generally channel-shaped body defining a base plate and spaced side plates secured to said base plate and extending downwardly therefrom, said side plates having longitudinally extending trackways on the inner faces thereof, a carriage within said generally channel-shaped body comprising a tool carrier surface and spaced upstanding flanges in parallel relation to said downwardly extending side plates of the tool body and having spaced inner walls, opposed toothed racks on said spaced inner walls of said upstanding flanges, antifriction rollers mounted on the outer sides of said carriage and received in said trackways in said side plates of the tool body to support said carriage in the tool body, a motor carried by said base plate of the tool body, a casing for said motor and a handle connected to said casing, a rotary shaft driven by said motor extending through an opening in said base plate in vertical relation thereto, a bearing supporting the shaft in said base plate opening, a segmental gear secured to said shaft below said base plate and positioned between said opposed toothed racks, said segmental gear being rotatable by said shaft to mesh alternately with said opposed toothed racks for imparting successive opposite movements to said carriage.

JOHN V. MARR. WILLIAM G. MERCER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 458,302 Koch Aug. 25, 1891 707,112 Horrocks Aug. 19, 1902 1,531,779 Gazo Mar. 31, 1925 1,873,011 Modglin Aug. 23, 1932 2,103,444 Bauch Dec. 28, 1937 2,354,616 Thrailkill Aug. 1, 1944 

